Brazing method for silicon carbide ceramics

A technology of silicon carbide ceramics and brazing method, which is applied in the direction of welding equipment, manufacturing tools, metal processing equipment, etc., and can solve the problems of intensified reaction between aluminum and silicon carbide ceramics, low bonding strength of brazed joints, and insignificant improvement of wettability etc. to reduce costs, achieve firm bonding, and improve wettability
CN112975032AActive Publication Date: 2021-06-18浙江浙能兰溪发电有限责任公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
浙江浙能兰溪发电有限责任公司
Publication Date
2021-06-18

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Abstract

The invention discloses a brazing method for silicon carbide ceramics. The brazing method comprises the following steps: carrying out surface treatment on the silicon carbide ceramics; depositing a first metal layer on the surface of the silicon carbide ceramics by adopting a vapor deposition method, and then depositing a second metal layer on the surface of the first metal layer to obtain the silicon carbide ceramics deposited with double metal layers, wherein the material of the first metal layer is selected from one of Ni, Ti, Fe or Zr, and material of the second metal layer is selected from Al; placing the silicon carbide ceramics needing to be connected in a vacuum sintering furnace, then placing a pure Al foil between the silicon carbide ceramics needing to be connected, starting heating when vacuum in the furnace reaches 10 <-1 > Pa, increasing the temperature to 600-800 DEG C, and conducting heat preservation for 10-60 min; and after heat preservation is finished, performing cooling to room temperature along with the furnace to obtain the silicon carbide ceramics subjected to brazing connection. According to the brazing method for the silicon carbide ceramics, the wettability of aluminum-based brazing filler metal to the silicon carbide material can be improved, the brazing temperature can be reduced, and the bonding strength of a brazed joint can be improved.
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Description

technical field

[0001] The invention relates to the technical field of brazing of silicon carbide ceramics, in particular to a brazing method of silicon carbide ceramics. Background technique

[0002] Silicon carbide ceramics have many excellent properties such as high temperature resistance, wear resistance, good thermal conductivity, excellent corrosion resistance and high mechanical strength, and have broad application prospects in the fields of nuclear industry, aerospace, military industry, automobile industry and electronics industry. At present, the connection methods of silicon carbide ceramics mainly include mechanical connection, bonding, active metal diffusion welding and metal brazing. Advantages become an important way of connection between silicon carbide ceramics.

[0003] Due to the poor wettability of metal aluminum liquid to the surface of silicon carbide ceramics, the bonding strength of the brazing joint of aluminum brazing silicon carbide ceramics is lo...

Claims

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